1 裂隙岩体三维动力接触模型.doc

具有特殊裂隙面岩质高边坡地震反应分析 党康宁，闫博，刘云贺 （西安理工大学水利水电学院， 摘 要： 关键词：高边坡；裂隙；地震；动力响应；数值分析 中图分类号：TU435 文献标识码：A Analysis of the seismic response for high slope with special fractured rock DANG Kangning，1，1 （Institute of Water Resources and Hydro-electric Engineering, Xi’an University of Technology, Xi’an 710048, China） Abstract：The seismic response of high slope special fractured rock was analyzed in this pape. Forced state and movement characteristics of discontinuity fracture surface were analyzed in detail. The constraint condition of discontinuity fracture surface was introduced by the penalty functions and Lagrange multipliers method. Based on generalized variational principle, the discontinuity theory framework of fractured rock mass was established, which was applied in the numerical analysis of a special discontinuous fracture surface of high rock slope with inverted wedge. The results showed that the method was reliable. The seismic response analysis of high rock slope did not linearly increase. The amplifier of peak acceleration at different elevation was staggered. The input seismic waves were affected by surface amplification of the slopes. The peak acceleration in the slope was greater than the mountain at the same elevation. The discontinuous fracture surface of rock mass has an important implication on seismic response of slopes, particularly more significant influence on the surrounding rock of discontinuous fracture surface. The study provides an important reference for the awareness of the dynamic characteristics of high slope engineering and later management. Keywords：high slope; fractured rock; seismic; dynamic response; numerical analysis 我国西部地区多高山峻岭峡谷，几乎所有开发建设的重大工程都涉及高边坡安全问题。西部又是我国主要的地震区，地震的烈度和频度都较高，重大工程对地震区难以避让，岩石高边坡在强震下的安全稳定问题成为需要高度关注和亟待解决的关键技术难题。地震作用导致高边坡失稳所造成的灾害令人触目惊心，其造成的次生灾害远超过地震本身直接造成的灾害，因而高边坡地震安全性研究成为地震工程和岩土工程领域重要研究课题之一[1]。 国内外众多学者在高边坡安全性等领域做了大量工作[2-5]，取得众多研究成果，但由于问题的复杂性，目前的研究远达不到工程的需要，有必要开展更广泛、深入的研究。 岩质高边坡最突出的问题是都存在不连续的节理裂隙面，在数值分析中遇到的最大问题是对其正确且较